Abstract:Paramagnetic resonance spectra of 4d1 (Nb4+ and Mo5+) and 5d1 (W5+) ions at substitutional cation sites in single crystals of tetragonal GeO2 have been studied at 92 K. Spin-Hamiltonian parameters obtained from hyperfine and superhyperfine (shf) structures are reported and compared with previously reported results for these ions and for V4+ (3d1), in rutile-structure GeO2, TiO2, and SnO2. Analysis of superhyperfine interactions with these nd1 impurity cations in GeO2 indicates that the unpaired spin is highly … Show more
“…Its Spin-Hamiltonian parameters correspond, within the experimental error, to those of isolated W4 in the substitutional sites of rutile, detected in W-doped TiO single crystals (21) ( Table 2). Similar signals have also been detected in Mo and W-doped SnO and GeO and assigned to Mo4 and W4 in the substitutional sites of these rutile-like matrices (22,23).…”
“…Its Spin-Hamiltonian parameters correspond, within the experimental error, to those of isolated W4 in the substitutional sites of rutile, detected in W-doped TiO single crystals (21) ( Table 2). Similar signals have also been detected in Mo and W-doped SnO and GeO and assigned to Mo4 and W4 in the substitutional sites of these rutile-like matrices (22,23).…”
“…In the most diluted sample (ZMo0.7(a)), which had the smallest amount of the tetragonal phase (27 wt%), the three-g-value signal of the Mo4 species predominated, but ? P "!69.4 ; 10\ cm\ (28). @ "…”
Section: Spin-hamiltonian Parameters Of Mo4 Speciesmentioning
confidence: 99%
“…For Mo4, the value of P "!69.4;10\ cm\ (free ion) is deduced from 1r\2 "5.9685 au (28). The spin-orbit constant, , is equal to the free-ion value ( "1030 cm\ (29)) times the reduction factor P/P (30).…”
Section: Symmetry and Energy Levels Of The Mo4 Speciesmentioning
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